An element that speeds up chemical reactions is called a/an

a. substrate.

b. enzyme.

c. calorie.

d. solvent.

Which statements describes h20 (l) and h2o2 (l) A) both are mixtures that have different properties B) both are mixtures that have the same properties C) both are compounds that have different properties D) both are compounds that have the same

Which of the following is true regarding the law of conservation of mass? A) It dictates that the number of molecules on each side of a chemical equation must be the same.

What it the main difference between an ionic and a covalent bond?

Which substance has vibrating particles in regular fixed positions

If a gas is formed when mixing two liquids together why might you not see any bubbles

How much ice at a temperature of - 17.5 ∘C must be dropped into the water so that the final temperature of the system will be 31.0 ∘C?

Why does a gas fill completely the vessel in which it is kept?

Individuals who work full time and those who work part-time enjoy basically the same number of paid leave benefits. True False

There is a large increase in ionization energy between the second and the third ionization energies of a metal. What kind of ion is the metal likely to form? Include the charge in your answer.

Which of the following are true statements about equilibrium systems? For the following reaction at equilibrium: CaCO3 (s) ⇌ CaO (s) + CO2 (g) adding more CaCO3 will shift the equilibrium to the right.